Answer:
They can sit in 19,958,400 ways
Explanation:
The seating arrangements matter based off of rank, which means that we use the permutations formula to solve this question.
Permutations formula:
The number of possible permutations of x elements from a set of n elements is given by the following formula:

In this question:
8 seats from a set of 12. So

They can sit in 19,958,400 ways